JP3088477B2 - Device for clamping plates to the plate cylinder of a rotary printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for clamping a plate on a plate cylinder of a rotary printing press, wherein the plate cylinder has a symmetrical axially extending groove. A clamping spindle rotatable about the axis of the body groove is arranged in the groove, the clamping spindle comprising at least two clamping grooves for receiving one end of the plate and a member for clamping the plate. And presses the other end of the plate against the wall of the groove after the partial rotation, and is provided with a support member for preventing the bending of the tightening spindle. Format.

[0002]

2. Description of the Related Art A device of the above-mentioned type for clamping a plate on a plate cylinder of a rotary printing press is disclosed in German Patent No. 3,339,339.
No. 185 is known. In this device, the plate cylinder has a symmetrical body groove extending in the axial direction. A clamping spindle rotatable about the axis of the groove is arranged in the groove and has two longitudinal slits for receiving one end of the plate. A support member for a tightening spindle is fixed to one of the two walls of the body groove. As a result, the risk of the clamping spindle flexing due to its longitudinal extension is avoided. By the way, since the plate cylinder can be operated clockwise or counterclockwise, the support member for the tightening spindle is mounted on the right or left wall of the cylinder groove depending on the predetermined rotation direction of the plate cylinder.

[0003] However, the disadvantages of the known fastening devices are as follows. That is, the support member must be fixed to the wall of the body groove, and particularly adhered, so that the support member does not unexpectedly come off or the mechanical member does not fall off. As a result, it is not possible to reverse the direction of rotation of the plate cylinder, which is necessary, for example, in a single-sided printing press.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotary printing press in which the direction of rotation of the plate cylinder can be freely selected after the plate cylinder has been mounted, and which can be adapted quickly and easily to the selected direction of rotation. To provide a device for clamping a plate to a plate cylinder.

[0005]

According to the present invention, there is provided, in accordance with the invention, an apparatus of the type described at the outset, in which the support member is mounted on a clamping spindle, the clamping spindle comprising:
It has two clamping grooves, wherein the support member is circumferentially
Viewed as being solved by have <br/> Rukoto that are spaced the same distance from each clamping groove.

[0006]

A further advantageous configuration of the device according to the invention is as defined in claim 2 .

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIG. 1 shows a part of the plate cylinder 1, that is, the plate cylinder 1.
The area where the body groove 2 is formed is shown in cross section. The cylinder groove 2 has a cylindrical hole 3 parallel to the plate cylinder 1 and two symmetrical mutually extending starting from the surface of the plate cylinder 1 and extending tangentially to the hole 3. It is mainly composed of slits 4 and 5. These slits 4 and 5 are provided for guiding the edge of the plate, and the walls 6 and 7 of each slit 4 and 5 are formed as the walls of the body groove 2. Further, a tightening spindle 8 is rotatably supported in the body groove 2. The clamping spindle 8 has two clamping grooves 9, 10 for receiving one end of the plate. In this case, the tightening spindle 8
The larger one of the two sections defined by the two tightening grooves 9 and 10 on the peripheral surface of is so arranged as to be equidistant from the respective tightening grooves 9 and 10 when viewed in the circumferential direction. The support member 11 is arranged. This support member 11 is advantageously formed as a mating key which is fixed to the clamping spindle 8 body by means of a screw 12 and whose outer periphery is polished with the clamping spindle 8. Further, the body groove 2 and the support member 11
In order to compensate for the error, the height of the support member 11 is adjusted by thin plates 13 having various thicknesses.

Now, a printing plate 15 having a tightening wire 14
Is hooked to one upper edge of the cylinder groove 2 by the bent front edge 16 so as to be tightened to the plate cylinder 1. The printing plate 15 wound around the printing drum 1 is guided into the drum groove 2 by a rear edge 17 provided with a tightening wire 14. At this time, the tightening spindle 8 is first adjusted so that one of the two tightening grooves 9 and 10 is located in front of the opening of the body groove 2. Then, the rear edge 17 is the trunk groove 2
This clamping spindle 8 is rotated so as to be drawn in. In this case, the clamping spindle 8 is rotated as necessary for the printing plate 15 to be clamped in a defined manner.

Which of the two tightening grooves 9 and 10 should be located in front of the opening of the body groove 2 and in which direction the tightening spindle 8 rotates to tighten the printing plate 15. Whether it must be done depends on the direction of rotation of the plate cylinder 1. For example, in FIG. 1, a clamping spindle 8 with a clamping plate 15 is shown in the clockwise printing cylinder 1. In this case, the front edge 16 of the printing plate 15 is hooked on the upper left edge of the body groove 2, and the rear edge 17 is received in the tightening groove 9 on the right side when viewed from the support member 11. . Then, in order to tighten the printing plate 15, the tightening spindle 8 rotates to the left. During this rotation, the support member 11 rotates toward the right wall 7 of the barrel groove 2, thereby supporting the clamping spindle 8. In contrast, FIG. 2 shows the clamping device according to the invention with the clamping plate 15 in the counterclockwise plate cylinder 1. The tightening device according to FIG. 2 is identical in all details to the tightening device according to FIG. Accordingly, the components of the device according to FIG. 2 will not be described again in detail here. In FIG.
Components that correspond to the components according to FIG. 1 have the same reference numbers as the components according to FIG. 1. However, the tightening device according to FIG.
Is different from the tightening device. That is, in FIG. 2, the front edge 16 of the printing plate 15 is hooked on the right upper edge of the body groove 2, and the rear edge 17 is received in the tightening groove 10 on the left as viewed from the support member 11. Have been. And printing plate 1
To tighten 5, the tightening spindle 8 rotates to the right.

The device according to the invention has the following advantages: That is, the printing plate 15 provided with the tightening wire 14 or another tightening assisting member such as a plurality of tightening projections is tightened to the plate cylinder 1 which can be driven alternately clockwise or counterclockwise. I have. For example, when the plate cylinder 1 now has to rotate in the opposite direction to that before with the plate to be clamped next, when clamping the plate 15, the clamping spindle 8 even returns to the appropriate starting position. do it. And in this case,
A change in the clamping device, for example a replacement of the component, and in particular the removal of the component whose configuration is to be changed and the subsequent refastening of the clamping device, is not necessary. In addition, with the tightening device of the present invention, the risk of the mechanical member falling out due to a poorly exchanged support member 11 and thereby the risk of injury to the operator or damage to the printing press are avoided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a portion of a clamping device according to the present invention having a clamping spindle adjusted for a clockwise driven plate cylinder.

FIG. 2 is a cross-sectional view of a portion of a clamping device according to the invention having a clamping spindle adjusted for a counterclockwise operated plate cylinder.

[Explanation of symbols]

 Reference Signs List 1 plate cylinder 2 body groove 3 hole 4,5 slit 6,7 wall 8 tightening spindle 9,10 tightening groove 11 support member 12 screw 13 thin plate 14 tightening wire 15 printing plate 16 front edge 17 rear edge

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-55-79157 (JP, A) JP-A-63-28648 (JP, A) Jikai Sho-63-184728 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) B41F 27/12

Claims (2)

(57) [Claims] 1. A device for clamping a plate on a plate cylinder of a rotary printing press, wherein the plate cylinder has a symmetrical axial groove extending in the axial direction, in which the groove is provided. A clamping spindle rotatable about the axis of the plate is arranged, said clamping spindle being at least two for receiving one end of the plate.
A clamping groove and a member for clamping the plate, and adapted to press the other end of the plate against the wall of the groove after partial rotation, and In a type provided with a support member for preventing deflection, a support member (11) is attached to a tightening spindle (8), and the tightening spindle (8) is provided with two tightening grooves.
(9, 10), wherein the support member (11) is
When viewed in the circumferential direction, the same distance is set from each tightening groove (9, 10).
A device for clamping a plate to a plate cylinder of a rotary printing press, characterized in that it is arranged in a closed position. 2. A support member (11) is formed as a fitting key, apparatus according to claim 1.